I will say this as a DM, playing with friends that have 1-2 year olds, is the worst.
Your friends are rolling into the session, sleep deprived, and mostly unaware of what their characters can do and what the rules are, as the parents of these newborns, (legitimately) have other concerns that results in D&D books not being opened outside of game time.
Like a school of fish, half of my group spawned, when 5e came out, and it took 2 years for the group to learn the Short Rest rules. I love my friends, we have gamed together for 20 years now, but it was a hellish, and very tedious 3 years of me as the DM shouldering the load, spending hours planing, and watching, people that are normally very advanced, power gamers just plain suck, for years.
Expecting players to understand basic rules, or how many attacks their 5th level Fighter gets from using Action Surge is not an entirely unreasonable assumption on the part of the DM.
Now of course, for the players that are parents, when grandma takes the children for an hour, and the parent can either eat, sleep, shower, or read the PHB...the PHB is not going to get read.
Now what I really loved, is when I told the group, that I was going to start DMing different campaigns, with the players in our main game that did not have kids, so we could get the complex play we desired...the players with newborns were FoMO upset.
(The Campaign was still going, and still is ongoing, these were new side games)
New parents and people that are going through their Medical School Residency period just lack the time for complex RPG campaigns. All participants in a game should recognize this. I know, I will never try again as the DM to nurse a game to Life, that consists of 50% of the players having newborns...